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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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New insight into CO photodesorption from C60.

Jan Mitschker1, Thorsten Klüner

  • 1Institute of Pure and Applied Chemistry, Theoretical Chemistry, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky Straße 9-11, 26129 Oldenburg, Germany.

The Journal of Physical Chemistry. A
|July 10, 2012
PubMed
Summary

Investigating carbon monoxide (CO) interacting with C(60) fullerenes reveals distinct molecular geometries in ground and excited states. Laser-induced photodesorption shows a unique mechanism with bimodal velocity distributions.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Computational Chemistry

Background:

  • Understanding molecule-fullerene interactions is crucial for materials science and nanotechnology.
  • The electronic states of fullerenes significantly influence their reactivity and adsorption properties.
  • Photodesorption is a key process in surface dynamics and thin-film deposition.

Purpose of the Study:

  • To investigate the interaction between carbon monoxide (CO) and C(60) fullerenes in both electronic ground and excited states.
  • To elucidate the geometric preferences of CO adsorbed on C(60) under different electronic conditions.
  • To simulate and understand the photodesorption mechanism of CO from C(60) induced by laser pulses.

Main Methods:

  • Calculation of two-dimensional potential energy surfaces for CO on C(60) in ground and excited electronic states.
  • Simulation of the photodesorption process using a short laser pulse.
  • Analysis of molecular dynamics and resulting velocity distributions.

Main Results:

  • Energetically favorable geometries for CO on C(60) differ between the ground state (vertical/horizontal) and the excited state (tilted ~40°).
  • Laser-induced photodesorption simulation revealed an interesting desorption mechanism.
  • A bimodal velocity distribution was observed for each rotational quantum state when desorbing from the rovibronic ground state.

Conclusions:

  • The electronic state of C(60) critically affects the adsorption geometry of CO.
  • Laser-induced photodesorption from the rovibronic ground state exhibits a complex mechanism leading to distinct velocity distributions.
  • These findings provide insights into molecule-surface dynamics relevant to fullerene-based systems.